We at Inspirations are very experienced at framing needlework. See here how we recently framed this pair of cross stitches treating each as individuals at the same time as ensuring they work as a pair.
The frames around each cross stitch are the same and they are framed to the same size.
Each has been given a double mount with the main, outer mount for each matching, but with the inner mount matching a specific colour in each of the cross stitches.