Yes, the JTAG ID for a Stratix® IV EP4SGX230 ES device is the same as a production device. The JTAG ID is 024090DD.
Although the JTAG ID is the same for engineering sample and production devices, the configuration / programming files are not compatible. Designs that originally target ES devices must be recompiled to target production devices.
If there is an attempt to program an ES programming file in to a production device or vise versa, then the device will reject the bitstream and CONF_DONE will fail to go high.