Maybe using "completely different" instead of distinctly different will solve the problem for people that do not seem to get it? Not sure because to me it is no clearer than the first (and then you get smart asses saying, "well it is not completely different... this word contains an s aswell and has vowels too" etc.
Distinctly different in this case is simply that no parts of the capital name are derived from the name of the country. If even I as a non-native english speaker find it obvious, native speakers really shouldnt have an issue with it. Though I know time restraints can really influence your cognitive abilities.
I think we should give them Moldova. It would help Moldova a lot, as they probably don’t have any good Pad Thai places right now.
but is distinctly different to it" to "begins with the same letter as its country, but does not contain the country name." ???
Possibly need another minute.