Adhivāsanā and Añjanśalākā are not usually done at the exact same time.

General sequence

• Adhivāsanā is usually done first, as a preparatory and sanctifying ceremony.
• Añjanśalākā is then performed later, at the main consecration time.

Usual timing

• Adhivāsanā: often done in the evening or the previous day/night, depending on the tradition and arrangement.
• Añjanśalākā: usually done during an शुभ मुहूर्त, most commonly in the morning or daytime, according to the chosen auspicious time.

Important note

Different Jain traditions and local customs may vary a little in exact procedure and timing, but in general:

• Adhivāsanā = preparatory ceremony
• Añjanśalākā = main ceremony

So, they are related ceremonies, but usually not simultaneous.