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@gbj_tester
Apparently the chainrings are 0.4mm closer together from 9s to 10s, and another 0.6mm from 10s to 11s, so your front indexing would be near enough if you use a 10s crank with 9s dérailleur, but the whole 1mm change from 9s to 11s will probably make it a PITA to set up without chain rub, especially as you're using a standard FD with compact rings.