The way that Mopar part numbers work is that later issued part get a different letters at the end of the part number.

What you have are a 2003 to 2008 cylinder head, they have the smaller intake ports.
Pre-Eagle style heads.

The intake ports are all the same on all the 2008 and earlier heads, they all flow the same.
Some are machined for an EGR valve and some aren't.
There's a difference between left and right heads on that era heads.

The intake ports look like this one in the first pic below.

The later Eagle heads look like the Edelbrock head in the second pic, the intake port is more of a square and noticeably larger..