Hi,
Once the ITA is received, you no longer have access to make modifications in your express entry profile as the profile gets locked. So, only the PR application has to be submitted with accurate information.
FYI, the ee profile gets expired after the IELTS result expiry date. So, as long as you submit your profile before the the IELTS result expiry, you're good. Because, your profile information is locked after the submission/AOR.