Here are some pics I took some time ago with my 2 1/4" SP and my 2 1/8" .357 M649. Not exactly what you asked for but close enough for Govt work. The stocks are off of the M649 to give a true picture of frame size on the J-Frame. I left the stocks on the SP since the factory stocks are the most commonly encountered.
I'm using Photobucket for photo hosting and have been having a LOT of trouble accessing pics lately. If the pics don't appear, refresh the browser a couple of times and they should appear OK. God, I HATE Photobucket! The "upgrades" made it REAL BUGGY for me, anyway!
The barrel on the SP is just SLIGHTLY longer than the barrel on the M649.
Butt length. The SP is just slightly longer than the M649.
Again, not much difference.
M649 on top of the SP. Again, the SP is SLIGHTLY taller and longer than the M649, not by much.
Left side views.
Right side views.
Bottom views. As you can see, the frame on the SP (especially in the trigger guard area) is slightly thicker/beefier than the frame on the M649, again not by much.
Front view of the crane area. Again, the SP is slightly thicker/beefier than the M649, but not by much.
Well, there you have it. I don't know how others feel, but because of the slight size and weight increase, the SP is MUCH more shootable for me than the J-Frame. I can get a full 3-finger grip on the SP (BARELY!), with the J-Frame I have my pinky hanging off with Boot Grips. With .357 ammo, the J-Frame physically hurt me to shoot it; the SP is actually comfortable to shoot with .357 ammo. Also, I IBOKed the action on my SP and the trigger, while a little heavier than the J-Frame, is MUCH SMOOTHER, also making it easier to shoot. While I would never turn down a free J-Frame, if I'm going to pay for it, give me the SP EVERY TIME!
Bub