0.9% Sodium Chloride for irrigation vs. 0.9% Sodium Chloride for injection in the operating room

Can we use 0.9% NaCl for irrigation to mix with medications (like Heparin, contrast, etc.) instead of 0.9% NaCl for injection in the back table? I see no difference aside from how they are contained (IV bag vs. bottle). 

I just know that using the saline irrigation is easier to pour; saves us time to prepare and cost effective.

Can anyone give me clarification about this. If you have any information from manufacturers please do share. Thanks!

[Rose_Queen, BSN, MSN, RN]

Here's a few previous threads:

https://allnurses.com/saline-injection-vs-saline-irrigation-t610459/

https://allnurses.com/irrigating-saline-vs-IV-saline-t29392/