You have the same dimensions, and radius shown for both. That’s not accurate.
The dimensions of an i.speed and an i.speed pro are the same. For example, in a 180cm, which I ski, they are 119-68-99 and the radius is 18M.
The dimensions of an i.race and and an i.race pro are also the same. In a 180cm, they are 123-69-103, and the radius is 16.3M.
The i.race/i.race pro in a 170cm is 122-68-102, and the radius is 14.4M. I ski them in that length.
I've had a number of pairs of the i.speed, which I had mounted with a RDX plate and race bindings. That is not how they were sold. I was able to get them flat directly from Head, and set them up that way. They later began to sell the ski with the race plate, and branded it as the "pro". Same thing for the i.race. They added the option of the race plate. This year they have changed the cosmetics.
I am not one who believes that the "Guts" of the skis are different between the pro, and the "non pro." I also believe that the same core and construction is used for both the i.race and I.speed. That's one man's opinion, logging a few hundred days on them.
They are great skis. I would be happy free skiing either ski. I ski them on either groomed or rock hard smooth surfaces, normally pretty steep to a bit less steep. I can bend either one into a variety of turn shapes. I don't pay much attention to the turn shape. I have skied them both in a couple of lengths. Normally I ski a ski in it's longest length. Not these. I much prefer the way they ski in a 170cm and 180cm. 185cm i.speed does not work as well for me.
And the I.speed is really a carver, a high performance one.....not a race ski. 170cm is a nice money length in the ski.
I also was given a Super Shape i.speed this fall, in a 177cm. That is 125-69-104 ski, 15M radius. Mine are mounted with a plate and race bindings. The ski is a completely different ski than the others, but a really fun and capable, versatile ski. It's easy to ski, and it does not need a head of steam to come alive. I and myself skiing it much ore often than I thought would. It's the sweet spot, size wise for that ski.
Hope that's not too confusing. If I had to pick one, for where I ski and what I ski o for terrain most of the time, it would be the i.speed pro.
I'm 5'10", 210 lbs., an older guy but very current and "OK with my skiing."