Is there a way to eliminate this texture so that when I mix the recordings, I get one clear and enhanced speech signal?
That depends A LOT on the details: what is your specific setup, what is the main reason they sound different, what exactly do you mean by "texture" and "clean", and what are the specific requirements of your application.
Root cause could be a lot of different things: different unit, different microphone type, different directivity, different placement in the room, different wind protection, different orientation, different pre-amp/acquisition chain, etc.
For starters you can try to time align both signals and match the Power Spectral Density of the recordings. See if that helps.