Well, if about pro boxers, there are/ were good guys from Thailand but I don't know had they training in MT too or only boxing training.
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I'm not that involved in MT at all.
Use elbows and knees there other arts too have plenty a lot but rules for tournaments are rules, otherwise DQ.
As for KB not rarerly if guy from TMAs does come in or initially for sport KB, not rarerly boxing training is used too.
I for example had lack in the hands depertament against other KB guys and plenty of guys too.
Then additional training in boxing helps a lot.
Especially because different rulers for clinch.
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For example if guy landed on me and I clinched him, under even more leneient rules I can cick him once and should release in 3 sec or 5 sec.
Ref will break clinch and if I didn't recovered enough when he allowed continue, guy will beat me even easier, for example with hooks etc.
Under MT rules I can keep clinch longer to recover more, can kick with knee not only once, rotate him.
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Common techniques are long range punch with step forward, like Cosmo vs Sage.
Owerhead, hooks, deep hooks, half hooks, half uppercuts, uppercuts.
For example like in boxing bout Charr vs Briedis ( this is former amateur kick boxer not only former amateur boxer ).
These bouts provide what kind of punches are characteristic also for euro ammy KB.
Next approach: boxing stylish or TMAish straights ( I once posted link where pointed how to use vertical and horizontal fist but this was done by not famous in fourms boxing coach ).
Hands pressing in chin or orbital bones: if isn't possible owecome guard, sometimes if a guy keep glove close to chin and preferably in line that enables decent contact, beating is done on opponent glove with intent to press his hand into his chin.
Contact with orbital bones is hard to achieve, but too, not rarerly when blocked kicks, more rare punches.
In forums it is considered as noobs mistake, but it not always is truth that only noobs suffer from this.
I also posted some links with euro KB guys bouts, but It didn't had interest, most likely because they aren't Tyson or Buakaw etc.