No, the bulbs are not the same. 2.2 KW for the -1 and as you say 1.0 KW for the -3. Some of your post does not read right to me.
"The manual said that it is rated at 1000w and the same for the -3.....".
The -3 is, in fact 1KW and the -1 is 2.2KW.
"Someday, I may try to pick up a -3.......".
This is what you just bought, right?
Not sure I understand what your friend was doing with a ballast resistor and a -1?
I had both of these lights. I would never attempt to modify them in any way and then run them. Both bulbs are under very high internal pressure and it would not take much to literally blow one up. If you have to remove one for any reason (I did), wear a welders thick leather apron, full lexan face mask and be sure every inch of your front is covered. Always triple check polarity of your hook-up. One instance of reverse polarity will fry internal parts. Same with hooking up some of the smaller control wires incorrectly. I think you already have a working cable - that's good.