I have a text layer and other one is also a text layer applied Gaussian blur.
Is there any way we can link two text layer such that as soon as we change one text layer text, other gaussian blurred text layer's text automatically changes?
I'm not a Sketch user, but a quick google search reveals that Sketch has symbols. So, I would try that route.
You could create a symbol from the text, and add two instances of it, one blurred, and one not blurred. Then if you edit the master, the instances will update.
Nearly all vector image editing software has similar functionality: Illustrator and Sketch call it a symbol. CorelDraw and Inkscape call it a clone.