EX4200 Hardware Difference - Old and New models

Hi All,

We have some old(about 5 years) working ex4200-48T switches off the rack. Should we buy new 4200-48T switches for our new project or use the old ones? . Is there any hardware enhancement on new models?. Will the old models support current JunOS code?

root@SW2-JUN> show chassis hardware
Hardware inventory:
Item Version Part number Serial number Description
Chassis BP0212394540 EX4200-48T
Routing Engine 0 REV 18 750-033063 BP0212396540 EX4200-48T, 8 POE
FPC 0 REV 18 750-033063 BP0212396540 EX4200-48T, 8 POE
CPU BUILTIN BUILTIN FPC CPU
PIC 0 BUILTIN BUILTIN 48x 10/100/1000 Base-T
PIC 1 REV 06 711-021271 AS0213204542 2x 10GE XFP
Xcvr 0 NON-JNPR UPR067D XFP-10G-LR
Power Supply 0 REV 05 740-020957 AT0512350924 PS 320W AC
Fan Tray Fan Tray

Thanks,

Aslam