Need a little frontal lobotomy 101

So I have an FX 400 royale with a couple of 300 and a 500 cc tank the 500 is too long to fit on it with a moderator that came on the gun even if you take it out of the stock is Still doesn’t want to go. I’ve got this really nice carbon fiber bottle brand new no valve and I’m wondering if the valve in the FX will change over to this valve the FX valve has no holes for a spanner wrench or removal tool. I’ll post a couple of pictures of both them side-by-side. Any help would be appreciated. Thank you.

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