As far as I know are the "PHR" series connectors a variant of the "PH" connectors. They also have a 2.0 mm pitch, but they differ slightly in their housing design. The primary difference in the "PHR" connectors is the presence of a latching feature on the housing. This latch helps to secure the connector halves together, providing additional stability and preventing accidental disconnections.
Check out this page: Common JST Connector Types – Matt's Tech Pages
Unfortunately there isn't an ideal solution for this. You will only see communities that at least user of your instance has subscribed to.
Posts in those communities will show up in your 'All' feed.
For all others is the best way an external community browser like this one:
https://lemmyverse.net/communities