No such engine code as G64B; did you mean G54B (2.6L), or are you just swapping one 4G64 2.4L for another of the same?

If they're both 4G64s, reckon you could just swap the oil pan from the old engine to the new one, if they differ.

Or if the old engine was a G54B, and the donor 4G64 wasn't one of these trucks, you may just need to find the right 4G64 oil pan for Mighty Max/Ram 50 applications, and/or maybe you need to change engine mount(s).