Bitcoin Core Re-install- Don't want to Overwrite Chain Previously Downloaded

I have a full Bitcoin chain that I downloaded using Bitcoin Core (v.0.18.0.0, from Ubuntu’s launchpad bitcoin ppa). I’ve moved to another machine and installed the Snap linked from BitcoinCore.Org, pointing it at my .bitcoin directory. When I run it, I get the following message. Before I hit "OK", I want to make sure I’m not going to nuke my already downloaded chain. Can anyone confirm?

As this is the first time the program is launched, … Bitcoin Core will download and store a copy of the Bitcoin block chain…. The wallet will also be stored in this directory.

[ ] use the default data directory
[x] use a custom data directory

When you click OK, Bitcoin Core will begin to download and process the full Bitcoin block chain (320GB) ….

[ ] Discard blocks after verification, except most recent 2 GB (prune)

Also, it’s been a while since I looked, but the Ubuntu PPA stable channel is now saying:

NOT MAINTAINED. The OS-library linking packages here had a series of issues.
PLEASE DOWNLOAD DIRECTLY FROM bitcoincore.org …

Is there any chance running that Snap might cause any issues with my wallet and already downloaded blockchain?