What is the difference between "سوف أستغفر لكم ربي" (I will ask my Lord to forgive you all) and "سأستغفر لك ربي" (I will ask my Lord to forgive you)?

Both phrases, "سوف أستغفر" (sawfa astaghfir) and "سأستغفر" (sa-astaghfir), are identical in meaning, as both indicate seeking forgiveness. According to Sibawayh, "sawfa" and "sa" are particles of futurism (tanfees). Some scholars have mentioned that "sawfa" carries a sense of anticipation or hope, unlike "sa."