p/s pulley interchange...

[xwaynestaticx03]

im trying to help another member on this board. hes in need of a p/s pulley for a 70 340 dart. i have a pulley off of a known 72 340 duster. the measurements look the same (not 100% sure because the pics arent great) but the pulleys look different. mine is 1 solid peice, but his pulley has cut outs in the middle section. are these pulleys essentially the same but just look different? i know there was 2 different options for p/s pumps, but is there a difference between the pulleys? thanks for the help...

 

[xwaynestaticx03]

here is a pic of the other guys pulley. mine does not look like this, as mine is solid with no portion of the pulley cut out like this one. do you guys see what i mean, or do you need a pic of my puylley to understand what im asking?