Can someone enlighten me about these two Stihl bars. The shorter one is from a 025, Longer is from a 028. Both .325, .63. Shorter says 18" and 68 DL, longer shows 18" from body of saw to tip of bar, and 74 DL, and is about 2" longer overall than the short one. It seems to me like the longer is a 20" bar but wouldn't that be stamped on it?