Something is definitely wrong. Your sensors should be reading within 1 mbar of each other. 1487 mbar is above the maximum for the device. I would expect the temperatures to be closer too, but that depends on your setup.
It's possible that there is a problem with one of your sensors. You could test that easily by trying it by itself with proven code. Another possibility is that the code in that multiple BMP library has a bug in the arithmetic. It can be that the code will work with a certain set of calibration parameters and fail with others.
Looking briefly at the code I see several places where parentheses appear to be missing.
For example:
x1 = (b2[sensnr] * (b6 * b6 >> 12)) >> 11;
is not the same as
x1 = (b2[sensnr] * ((b6 * b6) >> 12)) >> 11;
If I were you I'd take the arithmetic from a library you know works with both of your sensors independently and then check the math, line by line, making changes where it's different. Or go back to the datasheet and verify that the code is correct.