If you check those boxes and boxes of surplus Santa Barbara ammo that were on the market a few years ago, you will see that they are labelled prominently as "7.62 NATO Espanol", this being the special Spanish loading of the round.
It does have significantly lower pressures than the ammo used by the rest of NATO, but regular NATO ammo could be substituted for it in a pinch.
Neither the CETME nor the FR-7 should be fed a steady diet of the hot stuff.
As stated above, stay with handloads and don't go above the middle of the pressure range. You'll have no problems then at all and your rifle will be safe for a lifetime of use.
Third lug presence/absence doesn't really mean a lot. The third lug on the '98 only came to bear at all AFTER the action was seriously worn OR the locking-lugs ALREADY had been hammered back far enough for it to bear. Once assisted (while crying) in the destruction of a purely lovely 1948 commercial FN Mauser action which had been rebarreled to .264 WinMag. Guy brought the thing into the shop where I was working because it wouldn't extract. The rifle had been fired so much with handloads that were 'WAY to Hell and gone above maximum that the bolt locking-lugs had been hammered forward on the bolt shank. When he opened the action, it was trying to cam the fired casing back into the chamber! When we scrapped the action, you could see the locking-recesses where the bolt had been bearing: twin dents into the actual receiver from the pressure. Even the third lug was piened! He can thank Paul Mauser and the wonderful workmen at the FN that he even has his arms and eyes.
Your rifle doesn't have the third lug. So what? Neither does the Swede '96 and there's nothing wrong with them. Just stay in a sane pressure range and there should be no troubles.
Nice rifle, though, but I can't afford one!