Rawtenstall Cemetery is a fairly large cemetery with over 21000 burials.
The burial registers have been transcribed by lan-opc, indexed by name and date. The records are also searchable in the lan-opc search engine. However, there is no way to search by grave.
The pages linked below provide lists of graves ordered by grave number and a list of the people buried in each grave, along with links back to the lan-opc pages.
The graves are listed in numerical order when there is a number available. When there are two numbers, the first is used. Graves without a number or with an obviously incorrect number are listed as Unnumbered.
There appears to be no graves with numbers in the ranges 3001 to 3500 and 6001 to 6500.
The pages listed above are generated from the lan-opc files using a program called RawC_WhosInThatGrave.py, which you can find on Codeberg in the witg directory.