The theme music was the same, the presenter had a north Belfast accent... but this wasn't Stephen Nolan on the Stephen Nolan Show.
And, if you hadn't been listening to last week's trailers on BBC Radio Ulster, it might have taken you a moment or two to figure out who the smooth-voiced 'stand-in' was.
Eamonn Holmes was certainly in no hurry to reveal the name behind the voice.
Over two minutes - a veritable life-time in radio terms - had passed before he introduced himself to tens of thousands of listeners tuning in to "the biggest show in the country".
Perhaps, and as arguably the UK's most accomplished - and certainly its most omnipresent and highest earning - broadcaster, he doesn't really need to.
There was no hyperbole either ("Northern Ireland, thank you for having me" was the closest he came), no over-selling of the day's main headlines, just calm, slick, seemingly effortless presentation from someone who, despite being synonymous with television, has also been doing radio shows for the best part of four decades.
With the two biggest ongoing stories of the last five years - the Covid-19 pandemic and Brexit - dominating the day's agenda, there would be no problem filling the first hour of the 90-minute show.
Eamonn's 'demotion' of Alliance's deputy leader Stephen Farry to MLA - "they tell me you're an MP, I'm very sorry" - provided the only awkward moment of the first hour.
A touching and informative piece about Organ Donation Week was ultimately followed by a rather too matey encounter with Nolan regular and former Labour spin doctor Alastair Campbell, who had his latest book to plug.
Moments before the programme started, BBC Ireland reporter Emma Vardy took to Twitter to remind listeners of what was in store, using some good old Norn Iron vernacular.
"Do not adjust your dial, Eamonn Holmes in the chair on The Stephen Nolan show now, so it is! Give him a call. #welcomehome."
The occasional clunky moment aside, the ITV This Morning presenter's performance hit all the right notes and seemed in keeping with the "heal, not divide" promise he made on Twitter last week.
The sudden resurgence of the contentious Brexit/Irish border issue may, however, test both audience and presenter, who is used to more UK-wide listeners and viewers, in the days to come.
Fans later went online to voice their appreciation for the 60-year-old mellifluously-voiced 'stand-in'.
Jane Corscadden said on Twitter: "Weird listening to The Nolan Show and not wanting to rip my eyes out - get Eamonn Holmes his own show." (Will you tell her, or shall I, that up until February he already had a hugely popular drive-time one on national station TalkRadio and, surprisingly, gave it up?)
Another listener, Hannah Lyons, added: "Loving The Nolan Show this morning from the Causeway Coast."
Meanwhile, James McCarthy said: "Can we keep Eamonn for a bit and see how Nolan gets on on This Morning?"
Eamonn actually gave the Belfast Telegraph a name check within the first 23 seconds of the programme - cheers for that - but, despite promising to "track down" the absent, staycationing eponymous presenter, that didn't happen - maybe next time - and, for once, the Nolan Show stayed Nolan-less.
Long before stepping into the hot seat temporarily vacated by Nolan, the former UTV anchorman promised his 47-year-old fellow broadcaster that he'd take care of the large audience for a week, adding: "I'll try to do it the same.... only differently," he vowed.
"For listeners and you to know that 'The Biggest Show in The Country' is in good hands and that I am one of them, there to listen."
The listening bit works both ways. So far, so good, Eamonn.