xz print crc checksum

I have two files, of several gigabytes in size, which have been compressed with xz. I suspect the original files before compression are identical, but they've been compressed with different xz options so the compressed files are different. How can I verify that the files are identical without uncompressing them? As they're so large I would rather not uncompress them if I don't have to. I know that xz stores a CRC checksum, so I thought it should be easy enough: just print and compare the CRC checksums of each file. However the xz -l (and xz -l -v) command just lists the checksum as type "CRC64" instead of what the actual checksum is.