Bottle regulator threads not lining up.

I have a G1 Gauntlet and want to upgrade the bottle to 4500psi. I've now mistakenly purchased two different bottles with the thread size 9f m18x1.5 instead of 5/8 18unf is this a normal problem that I just need to get an extra part for? Or is it that these paintball regulators don't fit those on purpose?
Paintball is Co2? I'm no expert but I don't think they are interchange🤷‍♂️
 
The vast majority of CF bottles on the market have metric threads. One exception is the First Strike bottle being discussed here:

If you don’t want to go that route, a new metric regulator to go with one of your metric bottles may be an option. Less expensive for sure but check the location of the fill port and gauge to verify it will work for you (i.e. 180 degrees or 90 degrees from each other). And depending on what output pressures you find off the shelf, you may or may not need to adjust the setpoint.
 
The thing is a little is a little crazy now but found a metric regulator and got a 28 grain slug moving at 980fps
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