Code P1870 transmission issue

[superhampster]

I have the known issue where it shifts hard after long trips. I found a GM service bulletin that says this in it:

Install a control valve body with the revised TCC regulator and isolator valves. These valves are used in all transmissions produced after January 15, 1999 (Julian Date 9015), and all of the service parts currently available through GMSPO contain revised TCC regulator and isolator valves.

Will a control valve body out of a model newer than 99 be compatible with my 98 Sierra? I was thinking about visiting a junk yard.