Intel having its own fabs means that a lot of its R&D budget goes into fabrication technologies, packaging, etc. TSMC spends about $1B a quarter on R&D, as a point of comparison, and Intel might be spending more. Intel also has an FPGA division, which would be equivalent to AMD adding the Xilinx R&D expense ($200m+ a quarter). Intel's R&D is also working on self-driving cars....
In short, AMD's R&D is a lot more focused, so isn't comparable to Intel's. It's definitely possible that Intel is putting more into CPU and GPU tech than AMD, but not to the extent that a basic comparison of R&D expenditure will suggest.