Video bit rate after conversion

Hello everyone,
Im wondering, if i have a file of x format, with 50Mb video bitrate, and I convert it using compresor 4 to ProRess 422, the result will give me a video with .mov extentin with video bitrate around 120 Mb, if I convert it to Proress (LT) it will give a result of around 70Mb video bit rate.
Will the new outputs have true clean bit rate, I mean the margine btwn 50Mb and 120 or 70, will it be showed , so will the new video show a better result, or it will just show same result at 50Mb. 2nd, in case I reconvert from Proress 422 (LT) (70 Mb) to anyformat (not necessarly using cpmpressor 4) to any format havn video bit rate again 50 Mb, will the output be the same of the original 50Mb that had the x

If you are concerned about this issue, do your own tests.
Make a copy of a representative sample of your original material in ProResHQ, one in ProRes422 and one in ProResLT
Put your original in a ProRes4444 timeline in V1 and one of the copies in V2. Apply the difference matte.
Do you see anything? Do the same process for all three variants of ProRes.
Now, convert the material to your delivery format and put it back in the ProRes4444 timeline on V1 and one of the ProRes copies on V2 and apply a difference matte. Again, what do you see?
If you see a solid screen of black, there is no measurable difference between the files.
If you do see artifacts, do an A/B comparison on a good grading monitor - sometimes stuff that shows up in the difference matte can not be seen by the eye even in dedicated A/B testing.
Have fun.
x
fwiw - all ProRes varients are 10 bit codecs. They are designed to absorb a great deal of editing/compositing without degrading. This is why you want to get any material that was acquired in a long GOP, compressed format OUT of that format as soon as possible if you will be grading, compositing or doing any work beyond simple cuts.

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