Ok, I've been doing a bit of research, and some slightly surprising results I think:
There have actually been numerous occasions of EXACT opening round pairings, including Craig (Apr '12) and Gael (Aug '12); Nev (Sep '08) and Huddy (Mar '10); Mary (Sep '10) and Karl (Mar '12); Noel (Jul '09) and Jake (Nov '12)... and some others. Countless opening rounds have left the same average but through different values.
HOWEVER, here are the opening rounds that have occurred THREE times!
Debbie (Jan '09), Emma (Dec '11) and Paul (Jun '12) had:
£50,
£750,
£3,000,
£100,000,
£250,000Maria (Jul '07), Pat (May '09) and Stephen (Mar '11) had:
£5,
£10,
£500,
£10,000,
£100,000I'll look at final 5's at some point...