4060's handle 134 dB SPL, I don't think you will ever see anything this loud at a concert. I would personally go with these over the 4061's due to their higher sensitivity.
Yes, you can see SPLs this loud. I've had it happen a couple times. It was, of course, the bass that killed the recordings... even wearing earplugs it was physically uncomfortable. In all cases I was either FOH or stack taping, I would probably have had better results had I chosen / been able to tape from FOB. But yeah, you can see SPLs this loud...
Edit to add: I run 4060s. When I bought them I was unsure whether to go 4060 or 4061. Now that I've played with them for quite some time, now that I have a feel for what the mics are capable of... if I had to choose again I would take the 4060s.
best regards,
stephen