--Color differences in exports - Need to maintain color quality...

Here's the scoop...
I'm experiencing color differences and sharpness of text and graphics - basically everything in video --- from one export to another.
In this circumstance, I screen cast Powerpoint with Camtasia. I export the video in Camtasia with these settings:
Quicktime - TechSmith Ensharpen Codec.
I import into Premiere, do my edits...then export H.264 Format --- with custom settings that match Camtasia Exports - frame rate, resolution...etc...
Data Rate in Premiere - played around with diff settings...went initally with 3 min 4 mbps max --- then tested 5 min 6 max --- same results. I export them with Encoder.
Results =
- Quicktime - TechSmith Ensharpen Codec = darker, richer colors with enhanced sharpness
- H.264 from Premiere = lighter colors with more of a flat/less sharp look
I've compared in both Quicktime and VLC players
I've read that H.264 can produce color differences. I want an export that will maintain colors of Quicktime - TechSmith Ensharpen Codec at a data rate of around 1-2mbps. Have any suggestions?
Big Thanks

Jim, appreciate the insight.
Prior to posting, I forgot to mention I did adjust settings in GPU panel.
I've tested multiple computers now on various players (VLC, etc..), all with the same result --- the color difference exists on every computer. Final video's will be seen online, not a TV.
In light of this…what I've deducted is that - I still need to find an answer to my original question.
Is there an export that will maintain the quality and colors of Quicktime - TechSmith Ensharpen Codec at a data rate of around 1-2mbps?
Virtually none of the computers that people will be viewing these video's on are going to be color calibrated. It'd be comparable to the computers I've been testing on…
If I'm not seeing this clearly, then obviously let me know…I could be mistaken.
Thanks again

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--Color differences in exports - Need to maintain color quality...

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