Your successful swap of a good 2008/2009 VXY2010 DVD Drive fitted with the on-board controller PCB from your 2007 DVD Drive VXY1961 confirms that these model DVD Drives will interchange as long as the on-board controller PCB is also swapped between those different model-year DVD Drives.
I've revised this thread's first post to include this news for those with Panasonic EZ series recorders.
Those swapping DVD Drive controller boards should notice that the connector for the laser assembly ribbon cable has a flip-up locking/unlocking mechanism as seen in the first two photos. Also notice the ribbon cable grip-tab orientations as seen in the fifth photo. The three upper ribbon cables have their colored grip-tabs facing outward while the lower copper colored ribbon cable grip-tab faces inward. (The ribbon cable functions are, from top to bottom, 1-disc tray and slide-cam motor—narrow green grip-tab, 2-spindle motor—blue grip-tab, 3-laser assembly data cable—wide green grip-tab, 4-laser assembly transport motor--copper colored cable with inward facing dark brown grip-tab, 5-the ribbon cable seen at the lower left of the on-board PCB is the data cable connected to the Digital PCB.)
In recent weeks one of my DMR-EZ17 models has been having more frequent scheduled recording lock-ups when transitioning from PAUSE to RECORD. I've been considering swapping that 2007 VXY1961 DVD Drive on-board controller board with one from another DMR-EZ17 DVD Drive that has a failed laser assembly. At this point I'm unsure if this scheduled recording lock-up originates with the DVD Drive on-board controller PCB or with the separate Digital PCB.
I have a 2008 DMR-EZ28 that has the VXY2010 DVD Drive. Should it have a laser assembly failure it's good to know that VXY1961 and VXY2010 DVD Drives interchange as long as the original on-board controller PCBs are swapped between these DVD Drives. (I have four DMR-EZ17 models, one set aside as a standby recorder, one in daily use but with increasing scheduled recording lock-ups and two with failed laser assemblies.)
With regard to failed laser assemblies, Mickinct has experience replacing laser assemblies for a wide range of Panasonic models. He has mentioned that a single laser assembly model may be used in several model year DVD Drives.
For those considering the purchase of a replacement laser assembly one may find the model number on the underside of the laser assembly itself. Examples from 2006 and 2007 model year Panasonic DVD Drives are seen in the third and fourth photos.
EBay seller Gazglasgow lists several popular Panasonic OEM laser assembly models but that seller doesn't provide a complete list of Panasonic recorder models that use those model laser assemblies.
Gazglasgow's eBay laser assembly listings provide some basic instructions for the replacement procedure. Other AVS Forum posts address DVD Drive tear-down and reassembly procedures.