Assume they have the same development time.
Is it okay?
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If you are asking if it is OK to assume they have the same development time, then it is not.
This may be a useful guide to developing times for different film and developer combinations.
I shoot my last film long time ago, but if films require different kind of process/chemicals I will not risk to develop them together.
And I am sure you are not so short in time and/or chemicals, so just thread them separately :)
At the end all this is about the quality, not the speed (most of the time)