Coldcard seed XOR dumb questions

1. Can I import a seed from a different brand of hardware wallet to the Coldcard............and then XOR that seed?

2. When setting up seed XOR you can Choose to split a seed into 2, 3, or 4 parts. In this example say I choose a 2 part XOR split. When recombining to get the seed it says you may use A/B/C or C/A/B in any order to reconstruct the seed. I think the wording of the language has confused me a bit. In my example of a 2 part xor split is this the only outcome:

xor-A + xor-b = seed

The reconstruction described above would be the only possible way to obtain the seed, correct?

In other words, is the wording of the language only chosen that way for those who choose to split it into 3 parts or more.