| These lamps (F40T12 vs F32T8) are completely not compatible with each other, the mismatch is rather large.
Operating F32 on a F40 you may damage both the lamp, as well as the ballasts, mainly when speaking about HPF and unity ballast factor ballasts.
The F32T8 has way higher arc voltage and lower arc current rating (0.43A for F40T12 vs 0.27A for F32T8), so (depending on the exact ballast characteristic) it may be quite severely overdriven (up to 50W dissipated on a 32W rated tube), plus the primary winding could be overloaded (50W instead of 40W).
At the same time this higher arc voltage of F32T8 will lead to lower than normal secondary current of the ballast, which may lead to improper phase cancellation so lower power factor on the primary winding (assume HPF ballast), so causing even more overloading of it.
With "residential" low ballast factor NPF ballasts you may get away with it:
With NPF ballasts the loading on all winding gets lower on higher than rated arc voltages, so no harm from this direction.
With residential ballasts running the F40 lamps at 25W you won't overload the F32 either.
The only problem you may face is the F40 ballasts to not have enough OCV to reliably start the F32T8 lamps, mainly at lower temperatures.
But with the commercial HPF full power ballasts you may definitely run into overloading problems, the starting problem is then the same.
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