https://easygen.us/legacy-product-replacement/ 

Mechanical dimensions of front panel mounted easYgen-3500XT are same like easYgen-3500. Mounting space for easYgen-3400XT is same and new control is not as high as old easYgen-3400. New easYgen-3000XT controls provide same easYgen-3000 Modbus and CANopen Protocols, so that there is no need to touch upper PLC or PMS Systems. 

It is as well possible to mix old and new controls within application. Load share protocols are as well same. https://support.easygen.org/en/kb/articles/can-i-loadshare-different-easygen-2000-3000-xtcontrols Check 

Check out as well our FAQ Database answering a lot of your daily easYgen-3000XT related questions https://support.easygen.org/en/kb

All easYgen-3000XT product specs, manuals, configuration files, drawings, STP 3D Models, XLS Modbus protocol and more you can get here https://wss.woodward.com/manuals/PGC/Forms/AllItems.aspx -2 - First board of easYgen-3400/3500 and 3400XT/3500XT is same like in easYgen-3100/3200 and 3100/3200XT, only difference is a third additional CANopen CAN 3 port and additional 2 Ethernet Ports