Image urls are not consistent and keep changing

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I sent a list of our Shopify product image urls to some of our partners and they contacted me a few weeks later to tell me that the image urls aren't working anymore. 

I downloaded a product sheet and compared it to the initial one, and parts of the image url have changed.

For example: 

Old image: 

New image: 

These should both be the same. These are the same product. I haven't edited this product since before I sent the list out to our partners.

Does anyone know why this is happening and how I can stop this?