No identical amps at the moment, but I have close substitutes and digital backups.
As for guitars, I have two Strats set up nearly identical and I have to HH guitars setup nearly identical as primary/backup for SSS and HH tones. Those cover 95% of my playing with a dual P90 guitar, a Cabronita Tele, and an EVH being my single guitars for something different, but no backup needed. I really don't feel the need for any more variety than that, and I am looking to offload the other two electrics I own.
On the pedal side, I do have some multiples and some close substitutes. I have a pair of PoT's and a pair of DoT's although one Prince has the low gain mod and in both cases, I use the pairs together as a poor man's KoT. Then there's two Tonex Ones, different paint, but same pedal. I also have a couple Klones, a few envelope filters, a couple wah's, and a few compressors that are very similar and interchangeable but not identical. Edit: I also have two identical Sunface BARTs!