they will ask you the test number as i understand
on the canada.ca website the only info about the exam I could find states:
"You
must prove your language skills by taking an approved language test. To do this:
You must:
- schedule your test with an agency approved by IRCC and pay the costs
- enter the test results into your Express Entry profile (and the Personal Information Number, if the system asks for it)
- include the results with your application if you are invited to apply. If you don’t include it, we will not process your application.
Don’t ask for your language test results to be sent directly to us. Send us your results with your complete application. Keep your original test in a safe place as we may ask for it later."
So... there is nothing about the exam number or about forbidding you to mix results from different test dates..
It would seem logical to allow people to mix results.. But I dont want to base anything on logic as it is not always how things work..