Image service in 10.8 vs. 11.3

[forestknutsen1]

We have an application that uses an image servers from our 10.8.1 AGS. We would like to upgrade to 11.3. So, we are wondering if the image service will still work in the application with 11.3 AGS. Are there any major changes to the way image services work at 11.3?

Our image url:

https://xyzx.com/server/rest/services/Imagery/xxxx_2021/ImageServer

[JoshuaBixby]

There are no structural changes in the URLs of GIS services between ArcGIS 10.8.x and ArcGIS 11.3, that is an existing image service that is upgraded will have the same URL as before, and a republished image service with the same name will also have the same URL as before.  Is that what you are asking?

[MichaelVolz]

Is your image service built from a raster mosaic dataset (RMD) and published from ArcMap since you are still at 10.8.1?  I ask because I have a custom print service using 10.9.1 image services published from ArcMap whose print-outs get degraded when the same RMD is published from Pro.