And here is also my contribution.
The difference in both parts is in the end of the channel and in the diameter of the bottom of the channel.
First part has the R6.3 at the end of the channel. And the diameter of the bottom of the channel is 78mm (R39). According to your drawing, the diameter is OK, but the end radius of the channel is not.
Second part has the R7 at the end of the channel. And the diameter of the bottom of the channel is 76,4mm (R38,2). According to your drawing, the end radius is OK, but the dimaeter of the bottom of the channel is not.
The distance between the end of the channel and the slot is 10mm, but the dimension doesn't show any decimal places. The correct value is 9,874mm in first part and 10,05mm in second. To come closer to the desired value of 10mm, you have to change the distance in the sketch(3)"Sketch002". It's the dimension p32.
Hope this helps, too.