Most metal film resistors (usually blue in color) are specified to be within 1% tolerance of the given value. This is indicated by the brown stripe at the end of the colored bands. If you are using carbon film resistors (usually tan in color), they are usually 5% tolerance, indicated by the gold stripe at the end of the colored bands. If all you have is 5% resistors then you could hand match them. In practicality it’s really not that big of deal with the Cortado in your application. The weakest link in the chain by far will be how well you couple the disc to the floor boards. The audio fidelity of the system mostly hinges on that.
Good luck.
-Brach