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/u/falthu can only find Velvet buttons (spare parts) for sale, according to a question he put in a comment, no Wing buttons. So he was wondering how similar they are.
To me they look distinctively different, especially the shape. The Wing's buttons are slightly rounded in the length direction, while the Velvet buttons are rounded in the width direction, and straight in the length direction.
So I have doubts if they are compatible enough to use criss-cross.
Are there any Wing subredditors with more insights or tips?