Or yesterday afternoon was networked from another station that does have the new jingles, this morning was local programming still on the old ones?
The stations are all capable of split jingles though, there shouldn't be any reason why one station should have to use old jingles because the one it's taking a programme from has different ones
Technically they might have that capability, but in practice from the eastern network shows I've heard on Radio Cambs they don't seem to use it. All the network shows go out with generic 'your local BBC radio station' branding, so far with the Mcasso jingles.
The complication with split jingles is you ideally need them all to be the same length on every station playing them. When they're all the same jingle with a different voiceover that's easy. When you're trying to use different jingles from different packages, which are rarely the same length, they become very difficult to use in a way that sounds right on all the station.
Steve in Pudsey gave kudos