NEWER New Optiboot bootloader

The most important bit being E7DF EE27 FF27 0994 versus E7DF E0E0 FF27 0994 (E27 or 0E0)

The original has an instruction:

    7fd0:       e7 df           rcall   .-50            ; 0x7fa0 <watchdogConfi\
g>                                                                              
  __asm__ __volatile__ (                                                        
    7fd2:       ee 27           eor     r30, r30                                
    7fd4:       ff 27           eor     r31, r31                                
    7fd6:       09 94           ijmp

With the EE27 instruction being the "eor r30, r30" - an exclusive or with yourself is one way to clear the register.
The new version has "e0e0" instead, which is "ldi r30, 0" - which does the same thing (zero the register.) So you should be fine...