Is it true that piano notes are the same as violin notes?

No. The piano and the violin are different musical instruments and have different notes. While both instruments use the same musical alphabet (A-G), the pitches of their notes are different. The piano is a keyboard instrument, and its notes are produced by hammers striking strings of different lengths and thicknesses. The violin is a string instrument, and its notes are produced by drawing a bow across the strings, which vibrates and produces sound.