Different Camshaft Part numbers for 2014 model?
 

Was looking through the parts manual and found that the 2014 model year had different camshaft,cam gear, and valves part numbers. Anyone know the reason for the change in part numbers?

2012-2013
Intake cam gear RH SU003-00284
Intake cam gear LH SU003-00286
Exhaust cam gear RH SU003-00285
Exhaust cam gear LH SU003-00287
Camshaft Intake RH SU003-00180
Camshaft Intake LH SU003-00182
Camshaft Exhaust RH SU003-00181
Camshaft Exhaust LH SU003-00183
Intake valve SU003-00196
Exhaust valve SU003-00197

2014-
Intake cam gear RH SU003-05177
Intake cam gear LH SU003-05179
Exhaust cam gear RH SU003-05178
Exhaust cam gear LH SU003-05180
Camshaft Intake RH SU003-04741
Camshaft Intake LH SU003-04743
Camshaft Exhaust RH SU003-04742
Camshaft Exhaust LH SU003-04744
Intake valve SU003-04745
Exhaust valve SU003-04746

im not really sure why they have different parts numbers. the part # differences are not because of a supersession so i do not think there are any changes to the part. the only difference i can see between them is build dates, toyota does this when parts are built in different factories or first batch second batch. but i honestly have no real answer. this is just from my experience.

example -
Intake cam gear RH SU003-00284 2012-03 to 2013-08
Intake cam gear RH SU003-05177 2013-07 to 2013-09

One of the motors we tore down from a donor had significant camshaft journal wear (cam only, not head) but no signs of oil starvation in the rest of the motor. I'm thinking there could have been a hardness issue. First year woes maybe.