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Two map versions?

Former Member
Former Member
Earlier today I updated my nüvi 1490T (+ 4 GB SD card) via Garmin Express.

When previously updating I was advised about 'insufficient storage space', and had to manually remove the old maps form the SD card before the installation.
Today was different - I could download and install 'Europe NT 2015.20' (appr. 4 GB) without deleting anything.
After the installation I noticed that the new maps are placed on the SD card, whereas the nüvi still contains the previous map version (2014.xx).
The unit lists Europe NT 2015.20 under map info, and everything looks OK - but my question is: Should I manually remove the old maps to ensure that my navigation is supported by the newest map version??