Solar Orbiter is a new space observatory that provides unique capabilities to understand the heliosphere. In particular, it has made several observations of the far-side of the Sun, unobservable from the Earth. This data could be very useful to improve space weather forecasting, especially at maximum of activity when magnetic structures emerge and fade very fast. In this study, we aim at quantifying how this far-side data will affect simulations of the corona and the interplanetary medium, which are essential to space weather forecasting. To do so, we focus on a case with a single sunspot on the far-side in February 2021. We use two different input magnetic maps for our models, one that includes the far-side active region, and one that does not. We first use a semi-empirical model (Potential Field Source Surface) to evaluate its impact on coronal synthetic observations. Then, we use two different magnetohydrodynamics coronal wind models: Wind Predict and Wind-Predict-AW. To assess the impact of the far-side active region, we compare both models with both remote sensing and in situ observations. We find that the inclusion of the far-side active region in the various models has a small local impact due to the limited amount of flux of the sunspot and the fact that the region had a previous emergence. Interestingly, there is a more global impact on connectivity, with clear differences in the coronal hole boundaries on the Earth-facing side when the active region is included. The region also seems to disrupt the shape of coronal streamers, leading to a more challenging comparison with the observations. The PFSS and Wind Predict models failed to reproduce the observed 3-fold structure with the active region, while the inclusion of far-side data clearly improves the Wind Predict-AW results.