You mean the other school babies? I haven't spotted any yet, but it's a good question and I'd love to know if there are any others out there. I would especially love to know if there are any Alphabets with the ab symbol, rather than the e-e. I've never seen one...but...*shrug*. I do know there are some variations on the shade of Alphie's hair...maybe similar to Blackberry Pie (who I think is the year before in UK terms).
I mean, there are (at least) 6 versions of Baby Mischief and that's I think the same production year, so I wouldn't rule it out. There are also multiple prototype variations for the school baby set - Countalot I think only has 1, but Schoolbag has 2 and neither look like the released final version. So stuff was going on in 1991. o.O.
It's not quite as bad as 1986 or 1992, but it was there all the same...the weird.