sierra replacement filter

[reefman]

I was going to replace the filter element and noticed I bought a different one than what was on there. I have a sierra 18-7945 currrently and bought the 18-7944. Both are 10 micron but the 45 is a little longer. Anyone know if these are interchangeable? Also having a tough time getting it off even with a strap wrench, anybody have a suggestion t loosen this thing up?. Thanks