This was cool.I listened fairly close with ear buds. I'll venture bridges are like band pass filters,though not quite as extreme,same principle. The old bridge is warmer sounding,and not as much treble as the new bridge.This is highlighted with the feedback that occurs on the second chord sequence comparison up the neck with the newer bridge.Lively with more upper frequencies. This is evident in all the other comparisons. You might use the analogy of Stevie Ray Vaughan's comment in an interview i read once.A well known story. He said when comparing straight cords to his preferred coiled cords,the straight cords "pass too much electricity"...the inherent capacitance of the coiled cords filtered the signal, to a warmer sound. The type of pot metal here i believe has the same effect.The brighter later bridge, could be interpreted as clearer,because of the additional treble.But some might like the old bridge and find the warmer sound,with more upper frequencies filtered out leads to a clearer signal.Not as busy in the upper end. The point was brought up about the bridge saddles being sharp and to the point,making for a brighter signal.Another variable for sure.But overall i give the vintage bridge the vote for warmth and more bass frequencies.The new bridge for clarity and more treble,with seemingly less bass freq.different strokes. I had a similar experience when i swapped out a mexican tele vintage copy bridge(soft,easily bent pot metal) for an All-Parts nickel plated bridge with individual saddles on my Roadworn Tele. Type of bridge metal matters when doing a direct comparison.It became brighter,with more sustain.Lost some warmth, but better response up and down the neck.Resonance of the bridge and its filtering of the signal does change what the pickup see's. But funny,after a period of time,it has become warmer sounding to my ears.voodoo.Your ears change,or,did the bridge settle in?idk. I think after a period of time,this small a change doesn't really matter that much,and is only really obvious in a direct comparison like what the video showed.Your ears adjust. BUT, sum of the parts of an individual instrument. if you have an overly bright guitar,for instance,the later bridge might not be the ticket,and vintage pot metal could moderate that,as could a pickup change, and all the other little things. The video clearly demonstrates a difference.