Houser Helleberg vs Modified Helleberg Rim

[doublebuzzing]

Can anybody explain the differences? I have read that the Modified Helleberg is narrower but on the Houser spec sheet it says the rim width of the Helleberg is 7.11mm and the Modified Helleberg is 7.34mm.

[doublebuzzing]

The Helleberg rim is flat...an even-flatter version of the Conn 120 rim.
It is available in three embouchure openings - with the rim width/profile remaining the same.

The Helleberg modified is flat on the inner portion...perhaps 1/8" or so...and then tapers downward and is also thinned.
This one is also available in three embouchure openings - with the rim width/profile remaining the same.

I stock a couple of Houser-design rims, including both of these styles and the 33P.

(Most of the rims that I stock are my own designs.)

Is the inner edge the same sharpness on both?