Is the diploma obtained by the junior college on 3+3 the same as that obtained by the junior college entrance examination?

No, the 3+3 teaching mode is generally obtained after graduation from the teaching mode adopted by some vocational and technical schools or higher vocational colleges. The diploma should be the diploma of higher vocational colleges, and the college degree obtained by taking the college entrance examination in ordinary high schools may be the college degree of ordinary higher education. These two aspects are different, but they are all recognized by the state, so you can rest assured.