Of course IRL there is the plane’s silhouette on the HUD in search regime. On real MiG-29 (9-12, 9-13, 9-51) the IPV display works ONLY as a HUD repeater (no matter what regime), with the difference that the far right vertical line where the search area ends is not displayed on the HUD, also the scan area position in the vertical plane is shown only on IPV display, there is the antenna bar number currently scanned where in the same place on the HUD is the gun’s remaining rounds information.
On RL Su-27 there is tactical information/ hud repeater option for IPV display, selectable with a switch on IPV, TAKT/DUBL. This switch is also found on some later-series MiG-29, but it does nothing. The other minor difference I know of is that in radar/IRST search regime on Su-27 the plane’s silhouette on the HUD doesn’t have the vertical “tail”, only the wings, but in lock regime, nav and all other there is the “tail” like in MiG-29.
Bottom line, the decision to not include in LockOn bank angle on HUD in radar search regime was indeed very silly.