The Mosaick scenes resolution of the Sentinel-1 images to apply InSAR

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If it is possible for these two inquiries, please

  1. Does Mosaick reduce image resolution and thus affect the unwrapping process for applying the InSAR, please?
  2. I want to apply interferometry with two mosaick scenes; can I clip the area of interest from both scenes first before applying the InSAR? any affectes? Any advice, please.

I appreciate the support you can provide to me. thanks.