Replacing a Workhorse 7 ballast with a Workhorse 8

MuralReef

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#1
My 4 bulb T-5HO fixture with 54 watt bulbs recently stopped working. I am pretty sure the ballast went out. I have an extra Workhorse 8 laying around and the numbers are almost identical. My question is can I just swap them out?
 
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