Everything it replaces is straight up on the table for unchained, not as choices like you simply get that class feature, flurry of blows bonus feats and perfect self are all things you just get on the chart and at the same levels. So could it use this archetype or is there some wording somewhere that just says no?
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No, there is a paragraph on the introduction to unchained classes on PG. 8 that disallows unchained monk from using chained archetypes.
Finally, with the exception of the monk, these classes should work with any of the archetypes from previous books as long as the classes still have the appropriate class features to replace.
And even ignoring that, Flurry is not the same so cannot be considered the "same trade".