Threedecker ST should be a peer to Santa Ana (same gundeck layout and similar size, just a little older) and at most a little less than Orient, while Orient and Hibernia should be near-peer. Four-decker depends on whether you go pure historical (which should be negligibly better than threedecker, maybe a special effect for a better chance of mast/sail special damage) or Speculative like Backside BHR, which would be even MORE elephantine and potentially a gamebreaker punch unless countered by impaired mobility or with a fast decay-rate.

Generally, I'd say the Spanish threedeckers should be on par to 110-gun Ville de Paris (as should the unreleased Commerce de Paris 110's which are basically cut-down-by-one-portlength Oceans).