We have received a finished catalog design in CDR format for print from our partner company. We want to use the same items with a similar design to our catalog. But the issue is that we use Photoshop, Illustrator and InDesign. 
We somehow opened the Corel Draw pages in AI and then placed into ID and printed our catalog. On the PC the quality is ok but the quality is not what we want in the printed version. 

1-Is there any loss of quality? What should we do? Your advice?
2- Is it possible that there is loss in quality becuase of placing each page, into Indesign. What should be the correct way? 
3- Is it better to export as Pdf in Corel Draw than edit in Illustrator? 
Thanks.