Are you talking about backwards compatibility? As far as I know if the slot supports Pentium III slot 1 it should support Pentium II.
I have 2 computers each 1 year apart the 1st one is broken due to bad capacitors it was a Celeron processor or a Slot I pentium II only processor. Basically it has a Celeron 500 Mhz processor in it. But I do have Pentium II 400 Mhz laying around. I also have a Pentium III 550E that is also Slot 1 but the motherboard will not recognize it.
The other motherboard I have is Slot 1 only which originally ran the Pentium II 400 Mhz CPU, I try running a Pentium III 550E in it and it worked without having to do anything. These computers were running 1 12 GB HD and 155w PSU....
By the way I still have envelopes of SD RAM 32 - 64 MB sticks laying around somewhere. I did max the computers memory out when upgrading to Windows XP... 256 MB max memory...
If the motherboard is dead have you thought about checking for bulge capacitors? I think you can have all the capacitors replaced on the motherboard which will basically make them like brand new. As far as I can tell motherboards die due to capicators not giving them enough power more than the board that just goes bad.
The Slot conections and architectures are the same for Pentium II and III. But the question is more likely to the model
of the Pentium III and the BIOS architecture on the motherboard. This to ensure is able to manage the microcodes from the CPU.
I am afraid from the Intel’s prospective will be to test it directly and Intel at this moment does not have this type of CPU or compatible system boards.