[IBIS] Different PMOS and NMOS driver impedence

Hello Experts,

One of my IO cell has a buffer with different PMOS  and NMOS impedences.
PMOS impedence is approx 200 Ohms and that for NMOS is 96 Ohms.
In this case what should be the value of Rfixture for calculating IV VT
curves ?
Would it be Rfixture1 for calculating  pull down and falling waveforms and
Rfixture2 for  calculating  pull up and rising waveforms ?
If I do rise/pullup and  fall/pulldown simulations with different Rfixture
values, is it acceptable ?

Best Regards
Chetana

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