Happy birthday Bernardo! Here's the solution
I'm embarrassed to admit I didn't realize the numbers spelled out 'hb' until after solving :P
Step by Step:
To start, we can highlight the one number that matches - the 9 bottom right - as correct by bold and underlining it. As this sudoku only has 1 number that matches, we can also then cross out the entire rest of that row and column.
We can now highlight all the numbers that aren't possible in the right hand grid, in a situation such as the same number in the same row, column, box, or color as that cell in the left-hand grid. We can also cross out any number where the cell is already filled with a different number.
Consider the Numbers:
Looking at the yellow cells, there is a 4/9 pair in the remaining bottom 2. Not only is this a pair in a row, it is also a pair in a color which removes a lot of candidates elsewhere and leaves only one place for a 5 in the second column, at the bottom.
Solving the Puzzle:
This then leaves only one place for a 5 in the middle-left box - which is a match. This means the 6th and 8th row can now both also be completed. The bottom right cell must be an 8 due to a 4/9 pair in the same box, placing a 7 in the same box too. This 7 happens to be a match.
The Final Solution:
Now to finish off the left-hand side. The 6th column can be completed, which in turn completes the right middle box. The right-hand column can be completed, followed by the blue squares. The bottom right box can now be completed.
Finally, you can complete the grid. To start, the greens can be solved - followed by the pinks. This then solves the bottom left box, the bottom middle box, leaving this
The top left green must be a 6, and as the top left cell cannot be 8, everything falls into place, giving the solution: The puzzle is now complete! Happy solving!