Why are a couple words in Ma'oz Tzur different in some sidduriim?

Question

The Text I am referring to is:

רָעוֹת שָׂבְעָה נַפְשִׁי, בְּיָגוֹן כֹּחִי כָּלָה
חַיַּי מֵרְרוּ בְקֹשִׁי, בְּשִׁעְבּוּד מַלְכוּת עֶגְלָה
וּבְיָדוֹ הַגְּדוֹלָה הוֹצִיא אֶת הַסְּגֻלָּה
חֵיל פַּרְעֹה וְכָל זַרְעוֹ יָרְדוּ כְּאֶבֶן בִּמְצוּלָה .

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Transliteration:

Ra'ot sav'ah nafshi, byagon kohi kala.
Hayai mareru bkoshi, beshi'abud malkhut egla.
Uvyado hagdola hotzi et hasgula.
Heil par'o vekhol zar'o yardu ke'even bimtzula.

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The bolded words are sometimes different.

I have seen the 1st one as Kila instead of Kala
I have also seen the 2nd one as MeTzulah instead of BimTzulah

What is the difference in the translation?
Is there a difference?

Answer 1

Kila means "he/it ended" (transitive), here "he/it cut off my strength"; kala means "he/it ended" (intransitive), here "my strength cut out".

Yar'du k'even bimtzula means "sank like a stone in the [depths?]"; yar'du k'even m'tzula means "sank like a stone to the [depths?]". (Hebrew frequently drops the prefixed l- or suffixed -a that indicates a destination.) Yar'du k'even m'tzula could also mean "sank like a stone of the [depths?]" (i.e., "sank like the [depths?]' stone"), but that seems less likely to me.