Lets say I ran a LR script consists of usual web http/html protocol with the browser agent of Internet Explorer 8(IE8) using LR 11. The script were created using same LR version but with IE11. Kindly provide information whether this change in browser version affects anything & how exactly.
Also, please tell what happens for similar case if the record is done using LR12- IE11 & replay using LR11 - IE8.
If the server does not generate dynamic pages based upon browser type and version, then nothing from a server perspective. You may need to alter your number of download threads to accurately model a given browser however.
This thread should add some insight on the connections front
Load testing tools and concurrent connections per server browser simulation