Can you use AT3 strips in AlphaTrak2?

[elainejunko]

My foster kitty recently got diagnosed and I had two people donate AlphaTrak2 meters to me. The strips are way expired (2020 and 2021) and everything I've read says that the AT3 strips don't work in the old AT2 meters. Is that just so they can make money selling new meters or are they really not compatible? And are expired strips actually expired or can you still use them? (Granted these are SUPER expired, but in general do you have to throw them away the minute they're expired?)

I'm using a Relion for my home testing but wanted to check if there's any way to use the AT2 as a backup.