Bartok's fabulous Piano Concerto no.1

There are times when I listen to this movement that I am reminded of Stravinsky's Renard. It could simply be a matter of his use of ostinati but I hear commonalities between the two works. Renard was composed in 1916 and Barok wrote his Concerto in 1926. I am not accusing Bartok of anything, however I can't help wondering if Stravinsky's work had a greater influence than I previously assumed.