Is cwm rhondda and the German national anthem same tune?

No, Cwm Rhondda and the German national anthem are not the same tune. The German national anthem,Deutschlandlied, was originally composed by Joseph Haydn in 1797. Whereas, Cwm Rhondda was composed in 1907 by John Hughes , a welsh preacher. Although both are set to the same metre and sung to the same tune ("Austria"), the melodies and lyrics are distinct. The German national anthem consists of three strophes, while Cwm Rhondda has four.