FWIW there are different sizes but they are standardized and you can adapt most sizes to each other (although on the compressor side you only would want to size down). If you ever need to replace it you'll need to be careful with the line sizes but you should be able to find a compatible unit to your existing install.

Controllers, otoh, are a different story. You will probably need to replace your head units if you also replace the compressor with a different brand. Same story with being careful about line size.

Refrigerant isn't a big deal as you'll need to flush it and repressurize anyway if you replace these parts.