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The Canada Revenue Agency( CRA) will tell you your RRSP deduction limit on the Notice of Assessment they send. For example, your 2018 notice of assessment will have your 2019 RRSP deduction limit. Your RRSP deduction limit is the amount of RRSP you will be allowed to deduct on your tax return. There may be a pension adjustment related to your RPP which would affect your RRSP deduction limit but CRA will adjust for this on your RRSP deduction limit published on the notice of assessment.
So always use the notice of assessment information for your RRSP deduction limit.
Hope this helps
