Yugoslavia vs. Czechoslovakia: Two Former Countries

No. Yugoslavia and Czechoslovakia were separate Central/Eastern European countries that both dissolved in the 1990s.

• Yugoslavia (1918–1992): Six republics—Slovenia, Croatia, Bosnia & Herzegovina, Montenegro, Serbia, Macedonia.
• Czechoslovakia (1918–1992): Two republics—Czech Republic (capital Prague) and Slovakia (capital Bratislava).

Neither was the other's capital.