PC Card = good
CardBus = bad
ExpressCard = bad
The main issue is that the label PC Card was only used after CardBus came out. Before that it was simply referred to as PCMCIA while today PCMCIA refers to any of them. You might have to trust the absence of CardBus and ExpressCard and hope the best.
FAT32 should be ok for either FAT95 or CrossDOS.
Unfortunately some A1200’s and 600’s can be fussy with certain brands as well. Usually you are fine with Scandisk branded PCMCIA to CF card readers.
You have made sure you have in L: FAT95 . Also you have the Compactflash.device in DEVS and that the mount file is setup with the filesystem as L:FAT95 and device Compactflash.device
CrossDos doesn’t work with CF cards from what I believe, even in OS 3.2 or above. Had this issue and had to use FAT95 with a FAt32 formatted card.
Aminet has all the drivers you need. CFD133 for Compactflash.device and the mount file and FAT95 for the filesystem.
Again, you do not mention where in the world you are, so cannot answer the question about where to get a PCMCIA to CF quickly 🤷🏻♂️