Converting ai files to be printed from coraldraw

Does anyone have any advise how to improve some colour issues between programs? 

I use Adobe ai cc 2015 to produce artwork to be printed in china, where they use coraldraw.  Unfortunately 2 different factories are having the same problem, when they convert the files, all the colours become too vivid, especially the orange & purples are too bright. Is there anythink I could do to prevent this or is there anything I could suggest to them?   thanks 

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  • There is no converting involved. Simply import the ai file into Corel. I don't consider that to be a conversion. Are the colors Pantone, rgb or cmyk? Are the colors "too bright" when printed or as viewed on the screen? What color settings do they have their corel set at? Best to send files as pdf instead of ai.
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