No. When partitions or doors are installed on-site, their performance may be affected by several factors. While the installation may have been carried out as closely as possible to the standard and quality of that in the laboratory test, it is common that the on-site performance does not fare as well.
Why is this so? As opposed to a laboratory environment, the on-site conditions are generally different as most buildings possess several acoustic pathways. This is known as Flanking Transmission and it can occur through the junction of partitions, walls, ceilings, and even floors which will greatly reduce sound insulation.