defference between leverage of signal provoder and subscriber

 

 my leverage is 1:1000 but the signal I'm going to subscribe is 1:500, can i still subscribe it?

what is the difference between mql4 and mal5 signals, I use metatrader 4 platform can i subscribe to mql5 signals?Last one, shoul i let my pc on( Or use a vps) after subscribe a signal? 

 
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