I've mixed 'n' matched Shimano parts across several decades plus combined non-Shimano with Shimano with (usually) no ill effects. Shimano's compatibility tables are usually very conservative and sales-oriented. The reality is that many of their parts are cross-compatible across their range aside from a few well-documented inconsistencies.
Short version: go for it. You'll be fine.
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Jeff Wills
Comcast nuked my web page. It will return soon..