S4 Leko body 575w cap vs. 750w cap

Just inherited caretaking of a stock of S4 Lekos, half of which have 750w caps.  Is there any difference between the leko bodies that were originally designed for 575w caps and the newer bodies meant for 750's?

Are there any problems with using a 750w cap in an older body that was designed for 575w caps?

should i expect premature burning of reflectors over the long haul?

are there ratings for the bodies I should be aware of?

 

thanks in advance,

SJP

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