I have installed 2 different gromacs version on my machine. 

I can only source one version in my bash which calls a particular gromacs version. 

Is there any way to source 2 different version and use them at same time (with different set of commands)

I want to do this as I  calculations running on 1 version but I want to change force field and do another set of calculation at same time for which I would need to make changes in top folder. 

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