serostim & humatrope?

here's the thing, i have been on serostim, @ 2 iu's a day, 6 days a week, now as i am coming to the end of my second kit, my guy says he can't get serostim any more, only humatrope.
will taking the humatrope, after the serostim have any effect on the serostim? for some strange reason will either of the two negatively affect the other. i don't want to waste all the time and $$ on the serostim, if then switching to humatrope will have a negative affect.
any one ever heard of anything like this before?
has any one ever gone from serostim to humatrope before?
any and all responces will be appreciated.

made by the same company in PR .... u'll be fine with the humatrope

You'll be fine